The operation of a novel hot electron Vertical Cavity Surface Emitting Laser


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Balkan N., O'Brien A., Thoms A., Potter R., Poolton N., Adams M., ...More

SPIE Conference on Physics and Simulation of Optoelectronic Devices, San-Jose, Costa Rica, 26 - 30 January 1998, vol.3283, pp.162-170 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 3283
  • Doi Number: 10.1117/12.316680
  • City: San-Jose
  • Country: Costa Rica
  • Page Numbers: pp.162-170
  • Keywords: hot electron laser, surface emitting device, longitudinal transport, Vertical Cavity Surface Emitting Laser (VCSEL)

Abstract

The hot Electron Light Emission and Lasing in Semiconductor Heterostructure devices (HELLISH-1)is novel surface emitter consisting of a GaAs quantum well (QW), within the depletion region, on the n side of Ga1-xAlxAs p-n junction. It utilises hot electron transport parallel to the layers and injection of hot electron hole pairs into the quantum well through a combination of mechanisms including tunnelling, thermionic emission and diffusion of 'lucky' carriers. Super Radiant HELLISH-I is an advanced structure incorporating a lower distributed Bragg reflector (DBR). Combined with the finite reflectivity of the upper semiconductor-air interface reflectivity it defines a quasi-resonant cavity enabling emission output from the top surface with a hi,higher spectral purity. The output power has increased by two orders of magnitude and reduced the full width at half maximum (FWHM) to 20nm. an upper DBR added to the structure defines HELLISH-VCSEL which is currently the first operational hot electron surface emitting laser and lases at room temperature with a 1.5nm FWHM. In this work we demonstrate and compare the operation of UB-HELLISH-1 and HELLISH-VCSEL using experimental and theoretical reflectivity spectra over an extensive temperature range.